 /*******************************************************************************
  * Copyright (c) 2003, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.ui.internal.navigator.filters;

 import org.eclipse.jface.viewers.IStructuredContentProvider;
 import org.eclipse.jface.viewers.Viewer;
 import org.eclipse.ui.navigator.INavigatorContentService;
 import org.eclipse.ui.navigator.INavigatorFilterService;

 /**
  *
  * <p>
  * <strong>EXPERIMENTAL</strong>. This class or interface has been added as part of a work in
  * progress. There is a guarantee neither that this API will work nor that it will remain the same.
  * Please do not use this API without consulting with the Platform/UI team.
  * </p>
  *
  * @since 3.2
  *
  */
 public class CommonFilterContentProvider implements IStructuredContentProvider {

     private INavigatorContentService contentService;
     private Object [] NO_ELEMENTS = new Object [0];
  
  
     public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
         if (newInput instanceof INavigatorContentService) {
             contentService = (INavigatorContentService) newInput;
         }
     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
      */
     public Object [] getElements(Object inputElement) {
         if(contentService != null) {
             INavigatorFilterService filterService = contentService.getFilterService();
             return filterService.getVisibleFilterDescriptors();
         }
         return NO_ELEMENTS ;
         
     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.jface.viewers.IContentProvider#dispose()
      */
     public void dispose() {

     }

 }

